公开(公告)号：US20170201277A1

公开(公告)日：2017-07-13

申请号：US15471438

申请日：2017-03-28

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Lei WANG ,  Monin Sergey ,  Kuryshev Dmitriy ,  Buzykanov Sergey ,  Yingying Chen

IPC: H04B1/10

CPC classification number: H04B1/10 ,  H04B1/109 ,  H04B1/123 ,  H04L5/14

Abstract: The application discloses a passive inter-modulation PIM interference cancellation method and a related apparatus for a radio frequency module. The digital intermediate frequency unit of the radio frequency module includes: an obtaining subunit, configured to obtain a digital transmit signal from a transmit channel of the radio frequency module; a calculation subunit, configured to perform non-linear transformation on the digital transmit signal to generate a cancellation signal that is used to cancel a PIM component; and a superimposition subunit, configured to superimpose the cancellation signal reversely on a receive channel of the radio frequency module to cancel a PIM component of a receive signal, so as to cancel a PIM component of the radio frequency module to some extent and reduce PIM interference to receiving performance of the radio frequency module.

公开(公告)号：US10911084B2

公开(公告)日：2021-02-02

申请号：US16857815

申请日：2020-04-24

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Hao Wang ,  Yingying Chen ,  Yuping Luo

IPC: H04B1/12 ,  H04L27/01

Abstract: The present disclosure discloses a multichannel PIM digital cancellation circuit, including a first frequency-shift variable rate module, a second frequency-shift variable rate module, a first conversion circuit, a second conversion circuit, a duplexer, a second transmission duplexer, a channel combiner, a third conversion circuit, a cascaded filter circuit, a PIM canceller, a feedback circuit, and a first adder. The cascaded filter circuit compensates for channel responses such as a delay difference or a phase difference generated after a transmit signal passes through a digital domain downlink, a digital-to-analog converter, and an analog domain downlink; the cascaded filter circuit simulates a group delay unevenness characteristic of the duplexer in the multichannel PIM digital cancellation circuit; a cascaded filter fits an S parameter of the channel combiner in the multichannel PIM digital cancellation circuit, and precisely fits a combining process of the channel combiner in a digital domain, so that a signal capable of canceling a PIM interference signal of a multi-transmission and multi-reception inter-mediate radio frequency system that includes the channel combiner is finally generated in the present disclosure.